diff --git a/service/low_energy_client.cc b/service/low_energy_client.cc
index cc127c3..cb8bcf1 100644
--- a/service/low_energy_client.cc
+++ b/service/low_energy_client.cc
@@ -188,8 +188,8 @@
 
   if (!bda) return;
 
-  const char* addr = BtAddrString(bda).c_str();
-  if (delegate_) delegate_->OnMtuChanged(this, status, addr, mtu);
+  std::string addr = BtAddrString(bda);
+  if (delegate_) delegate_->OnMtuChanged(this, status, addr.c_str(), mtu);
 }
 
 // LowEnergyClientFactory implementation